Only the air reaching the is available for gas exchange. when air is moved from the atmosphere into the respiratory tract, a portion of it remains in the . this collective space, where there is no exchange of respiratory gases, is referred to as the , and it has an average volum

Match each law or principle to its description. 1. law of original horizontality sediment continues to spread in a flat plane until it hits an edge or runs out of material. 2. law of superposition the youngest strata are at the top and the oldest are at the bottom. 3. law of original lateral continuity sediment gets pulled down by gravity in a horizontal and flat layer. 4. law of cross-cutting or intrusive relationships if there is a fracture or intrusive feature seen in rock strata, it is younger than the rock strata.